You have to rake out at least the top 3mm of the existing grout first.
Then you can re-grout with an appropriate grout as normal.
Yes, you can regrout over old grout to refresh the appearance of the tiled surface.
To effectively regrout a tile floor, follow these steps: Remove old grout using a grout saw or rotary tool. Clean the tile surface thoroughly. Mix new grout according to manufacturer instructions. Apply new grout with a rubber float, pressing it into the joints. Wipe off excess grout with a damp sponge. Let the grout dry for 24 hours, then seal it to protect against stains and moisture.
You can replace just one tile without too much grief. First you need to obtain a look alike tile. Then you need to chisel the existing tile out. Put the new one and regrout with comparable grout as used before.
If installed correctly, 50+ years. Although in that time you will most likely need to regrout in 15 or 20 years.
Most likely if bleach has lightened it, you will not be able to simply reverse the problem. The easiest solution is to paint the grout. Most tile stores will sell this. It is thinner then paint, but you will see very good and quick results. The only other real option is to regrout the floor. Since this is time consuming and messy, grout paint is the best choice.
White vinegar and water is the best grout cleaner ever. After you have completed getting the stains out, wipe away again, and apply good sealer. With that you won't have to clean it like that again for a long long while.
What in America is called the 'first floor' is called the 'ground floor' in Britain. The floor immediately above that is the 'first floor', what Americans would call the 'second floor'.
it means mezzanine floor, a floor which is between the ground floor and the first floor.
No, the word "floor" is not an adverb.The word "floor" is a noun ("the floor was yellow") and a verb ("I will floor him if he comes near me").
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a floor
Floor is sloped toward floor drain for draining. Floor cleanout is level with floor and is used to clean out drain line.